package com.app.notepad.ui;

import com.app.notepad.R;
import com.app.notepad.adapter.ExpandableListViewAdapter;

import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;

import com.ikimuhendis.ldrawer.ActionBarDrawerToggle;
import com.ikimuhendis.ldrawer.DrawerArrowDrawable;

import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;

/**
 * Fragment used for managing interactions for and presentation of a navigation
 * drawer. See the <a href=
 * "https://developer.android.com/design/patterns/navigation-drawer.html#Interaction"
 * > design guidelines</a> for a complete explanation of the behaviors
 * implemented here.
 */
public class NavigationDrawerFragment extends Fragment {

    private String LOGTAG = NavigationDrawerFragment.class.getSimpleName();

    private Context context;

    /**
     * Remember the position of the selected item.
     */
    private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";

    /**
     * Per the design guidelines, you should show the drawer on launch until the
     * user manually expands it. This shared preference tracks this.
     */
    private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";

    /**
     * A pointer to the current callbacks instance (the Activity).
     */
    private NavigationDrawerCallbacks mCallbacks;

    /**
     * Helper component that ties the action bar to the navigation drawer.
     */
    private ActionBarDrawerToggle mDrawerToggle;
    private DrawerArrowDrawable drawerArrow;

    private DrawerLayout mDrawerLayout;
    // private ListView mDrawerListView;
    private ExpandableListView mDrawerListView;
    private ExpandableListViewAdapter mExpandableListViewAdapter;

    private View mFragmentContainerView;

    private int mCurrentSelectedPosition = 0;
    private boolean mFromSavedInstanceState;
    private boolean mUserLearnedDrawer;

    private int lastItem = -1;

    public NavigationDrawerFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	// Read in the flag indicating whether or not the user has demonstrated
	// awareness of the
	// drawer. See PREF_USER_LEARNED_DRAWER for details.
	SharedPreferences sp = PreferenceManager
		.getDefaultSharedPreferences(getActivity());
	mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);

	if (savedInstanceState != null) {
	    mCurrentSelectedPosition = savedInstanceState
		    .getInt(STATE_SELECTED_POSITION);
	    mFromSavedInstanceState = true;
	}

	// Select either the default item (0) or the last selected item.
	selectItem(mCurrentSelectedPosition);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
	super.onActivityCreated(savedInstanceState);
	// Indicate that this fragment would like to influence the set of
	// actions in the action bar.
	setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
	    Bundle savedInstanceState) {
	mDrawerListView = (ExpandableListView) inflater.inflate(
		R.layout.fragment_navigation_drawer_expandable, container,
		false);

	mExpandableListViewAdapter = new ExpandableListViewAdapter(
		getActionBar().getThemedContext());
	mDrawerListView.setAdapter(mExpandableListViewAdapter);
	// mDrawerListView.expandGroup(0);
	mDrawerListView
		.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
		    @Override
		    public boolean onGroupClick(ExpandableListView parent,
			    View v, int groupPosition, long id) {
			return false;
		    }
		});
	mDrawerListView
		.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
		    @Override
		    public boolean onChildClick(ExpandableListView parent,
			    View v, int groupPosition, int childPosition,
			    long id) {
			Log.e(LOGTAG, "groupPosition=" + groupPosition
				+ ",childPosition=" + childPosition);
			return false;
		    }
		});
	mDrawerListView.setOnGroupExpandListener(new OnGroupExpandListener() {

	    @Override
	    public void onGroupExpand(int groupPosition) {

		if (lastItem != groupPosition && lastItem >= 0) {
		    mDrawerListView.collapseGroup(lastItem);
		}
		lastItem = groupPosition;
	    }
	});

	return mDrawerListView;
    }

    public boolean isDrawerOpen() {
	return mDrawerLayout != null
		&& mDrawerLayout.isDrawerOpen(mFragmentContainerView);
    }

    /**
     * Users of this fragment must call this method to set up the navigation
     * drawer interactions.
     * 
     * @param fragmentId
     *            The android:id of this fragment in its activity's layout.
     * @param drawerLayout
     *            The DrawerLayout containing this fragment's UI.
     */
    public void setUp(int fragmentId, DrawerLayout drawerLayout) {
	mFragmentContainerView = getActivity().findViewById(fragmentId);
	mDrawerLayout = drawerLayout;

	// set a custom shadow that overlays the main content when the drawer
	// opens
	mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
		GravityCompat.START);
	// set up the drawer's list view with items and click listener

	ActionBar actionBar = getActionBar();
	actionBar.setDisplayHomeAsUpEnabled(true);
	actionBar.setHomeButtonEnabled(true);

	// ActionBarDrawerToggle ties together the the proper interactions
	// between the navigation drawer and the action bar app icon.
	drawerArrow = new DrawerArrowDrawable(context) {
	    @Override
	    public boolean isLayoutRtl() {
		return false;
	    }
	};

	// ActionBarDrawerToggle ties together the the proper interactions
	// between the navigation drawer and the action bar app icon.
	mDrawerToggle = new ActionBarDrawerToggle(
		(ActionBarActivity) getActivity(), /*
						    * host Activity
						    */
		mDrawerLayout, /* DrawerLayout object */
		drawerArrow, /* nav drawer image to replace 'Up' caret */
		R.string.navigation_drawer_open, /*
						  * "open drawer" description
						  * for accessibility
						  */
		R.string.navigation_drawer_close /*
						  * "close drawer" description
						  * for accessibility
						  */
	) {
	    @Override
	    public void onDrawerClosed(View drawerView) {
		super.onDrawerClosed(drawerView);
		if (!isAdded()) {
		    return;
		}

		getActivity().supportInvalidateOptionsMenu(); // calls
							      // onPrepareOptionsMenu()
	    }

	    @Override
	    public void onDrawerOpened(View drawerView) {
		super.onDrawerOpened(drawerView);
		if (!isAdded()) {
		    return;
		}

		if (!mUserLearnedDrawer) {
		    // The user manually opened the drawer; store this flag to
		    // prevent auto-showing
		    // the navigation drawer automatically in the future.
		    mUserLearnedDrawer = true;
		    SharedPreferences sp = PreferenceManager
			    .getDefaultSharedPreferences(getActivity());
		    sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true)
			    .commit();
		}

		getActivity().supportInvalidateOptionsMenu(); // calls
							      // onPrepareOptionsMenu()
	    }
	};

	// If the user hasn't 'learned' about the drawer, open it to introduce
	// them to the drawer,
	// per the navigation drawer design guidelines.
	if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
	    mDrawerLayout.openDrawer(mFragmentContainerView);
	}

	// Defer code dependent on restoration of previous instance state.
	mDrawerLayout.post(new Runnable() {
	    @Override
	    public void run() {
		mDrawerToggle.syncState();
	    }
	});

	mDrawerLayout.setDrawerListener(mDrawerToggle);
    }

    private void selectItem(int position) {
	mCurrentSelectedPosition = position;
	if (mDrawerListView != null) {
	    mDrawerListView.setItemChecked(position, true);
	}
	if (mDrawerLayout != null) {
	    mDrawerLayout.closeDrawer(mFragmentContainerView);
	}
	if (mCallbacks != null) {
	    mCallbacks.onNavigationDrawerItemSelected(position);
	}
    }

    @Override
    public void onAttach(Activity activity) {
	super.onAttach(activity);
	context = activity;
	try {
	    mCallbacks = (NavigationDrawerCallbacks) activity;
	} catch (ClassCastException e) {
	    throw new ClassCastException(
		    "Activity must implement NavigationDrawerCallbacks.");
	}
    }

    @Override
    public void onDetach() {
	super.onDetach();
	mCallbacks = null;
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
	super.onSaveInstanceState(outState);
	outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
	super.onConfigurationChanged(newConfig);
	// Forward the new configuration the drawer toggle component.
	mDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
	// If the drawer is open, show the global app actions in the action bar.
	// See also
	// showGlobalContextActionBar, which controls the top-left area of the
	// action bar.
	if (mDrawerLayout != null && isDrawerOpen()) {
	    inflater.inflate(R.menu.global, menu);
	    showGlobalContextActionBar();
	}
	super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
	if (mDrawerToggle.onOptionsItemSelected(item)) {
	    return true;
	}

	if (item.getItemId() == R.id.action_example) {
	    Toast.makeText(getActivity(), "Example action.", Toast.LENGTH_SHORT)
		    .show();
	    return true;
	}

	return super.onOptionsItemSelected(item);
    }

    /**
     * Per the navigation drawer design guidelines, updates the action bar to
     * show the global app 'context', rather than just what's in the current
     * screen.
     */
    @SuppressWarnings("deprecation")
    private void showGlobalContextActionBar() {
	ActionBar actionBar = getActionBar();
	actionBar.setDisplayShowTitleEnabled(true);
	actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
	actionBar.setTitle(R.string.app_name);
    }

    private ActionBar getActionBar() {
	return ((ActionBarActivity) getActivity()).getSupportActionBar();
    }

    /**
     * Callbacks interface that all activities using this fragment must
     * implement.
     */
    public static interface NavigationDrawerCallbacks {
	/**
	 * Called when an item in the navigation drawer is selected.
	 */
	void onNavigationDrawerItemSelected(int position);
    }
}
